Emily Blunt is always in great shape, and evidently she works hard to keep it that way -- she was just spotted getting her butt kicked during a session with her personal trainer!

The 29-year-old took to the UCLA campus track in L.A. on Wednesday to work on her fitness.

The British beauty ran laps before completing some rigorous circuit training, and then finished with a deadly stair climb -- all during one of the hottest days of the year so far!

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We're not sure if Emily is in training for her turn as a soldier in the sci-fi flick "All You Need Is Kill" with Tom Cruise, which is scheduled to shoot later this year, or if she's just staying fit and healthy for herself and hubby John Krasinski. The cute couple just celebrated their 2nd wedding anniversary on Tuesday. Congrats!

Click "Launch Gallery" above to see shots of Emily's hardcore workout, plus more pics of stars staying healthy!

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